How to Fix “Ship contains modules that exceed reactor class” in Starfield

Starfield is a space role-playing game by the award-winning creators of The Elder Scrolls V: Skyrim.

You can create any character and go on a journey to answer humanity’s greatest mystery.

Customize your character’s appearance, decide their background, and select their traits.

Join Constellation, the last group of space explorers finding artifacts throughout the galaxy.

Explore more than one thousand planets, navigate cities, and traverse wild landscapes.

You can also pilot and command the ship of your dreams, personalize the look of it, and more.

In this guide, you’ll learn how to fix “Ship contains modules that exceed reactor class” in Starfield on PC, Xbox, or PS4/PS5.

Here is a list of known fixes from the Starfield community:

Fix 1: The ship you’re creating is at a higher class than your low level reactor. You need a stronger reactor, Habs, and Storage. To build a Class C Ship (highest class) and a powerful reactor, level up Piloting to level 4. To do this, join Vanguard in New Atlantis and replay Flight Simulator multiple times. Upgrade your Ship Design perk too. (source: Beneficial_Report_81 on Reddit).
Fix 2: From best to worst it’s C class (best), B class, A class (worst). Other starship modules are reliant on what class your reactor is. For example, if your reactor is B class, you can only have B or A class modules on it (source: suckmywigglypiggly on Reddit).
Fix 3: A, B, C is based on your reactor. If you have an A reactor, you can only have A parts. If you have a B reactor you can only have A or B ship parts. If you have a C reactor, you can have A, B, or C ship parts (source: Sweqly on Reddit).
Fix 4: For me it’s always the shield not matching (source: Eh_Vix on Reddit).